Ambiguities in measuring the physical parameters for twisted-nematic liquid crystal spatial light modulators

Jeffrey A. Davis; David B. Allison; Kevin D'Nelly; Michael L. Wilson; Ignacio Soriano Moreno

doi:10.1117/1.602113

1 April 1999 Ambiguities in measuring the physical parameters for twisted-nematic liquid crystal spatial light modulators

Jeffrey A. Davis, David B. Allison, Kevin D'Nelly, Michael L. Wilson, Ignacio Soriano Moreno

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Optical Engineering, Vol. 38, Issue 4, (April 1999). https://doi.org/10.1117/1.602113

There is great interest in using commercially available twisted-nematic liquid crystal displays as programmable spatial light modulators. Proper use of such displays, particularly as phase-only filters for optical correlators or as diffractive optical elements, requires knowledge of the physical parameters of the device including the twist angle, the birefringence, and the orientation of the director axes. A simple experimental technique was published for evaluation of these parameters. When we used this technique, however, we found a number of different sets of values that satisfied the experimental data. We demonstrate that additional measurements at different wavelengths can resolve these ambiguities and provide valuable information about the wavelength dependence ofthe birefringence.

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Jeffrey A. Davis, David B. Allison, Kevin D'Nelly, Michael L. Wilson, and Ignacio Soriano Moreno "Ambiguities in measuring the physical parameters for twisted-nematic liquid crystal spatial light modulators," Optical Engineering 38(4), (1 April 1999). https://doi.org/10.1117/1.602113

Published: 1 April 1999

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